diff --git a/SUMMARY.md b/SUMMARY.md
index 6174a65..cfd51ea 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -17,3 +17,5 @@
     - [Telefone/Celular](docs/UTILITARIOS/TELEFONE.md)
     - [UUID](docs/UTILITARIOS/UUID.md)
     - [Boleto](docs/UTILITARIOS/BOLETO.md)
+  - [Extensões](docs/EXTENSOES/README.md)
+    - [Joi](docs/EXTENSOES/JOI.md)
diff --git a/docs/EXTENSOES/JOI.md b/docs/EXTENSOES/JOI.md
new file mode 100644
index 0000000..9258111
--- /dev/null
+++ b/docs/EXTENSOES/JOI.md
@@ -0,0 +1,74 @@
+# Joi
+
+## Integração com br-docs
+
+A extensão de Joi do **br-docs** adiciona um novo tipo chamado `document` com regras específicas para documentos brasileiros.
+
+### Instalação
+
+```bash
+npm i br-docs joi
+```
+
+### Uso básico
+
+```typescript
+import Joi from "joi";
+import documentExtension from "br-docs/joi";
+
+const JoiExtended = Joi.extend(documentExtension);
+
+const schema = JoiExtended.object({
+  cpf: JoiExtended.document().cpf().required(),
+  cnpj: JoiExtended.document().cnpj().required(),
+  nis: JoiExtended.document().nis().required(),
+  cnh: JoiExtended.document().cnh().required(),
+  cep: JoiExtended.document().cep().required(),
+  telefone: JoiExtended.document().phone().required(),
+  pix: JoiExtended.document().pix().required(),
+  boleto: JoiExtended.document().boleto().required(),
+  celular: JoiExtended.document().celular().required(),
+});
+
+const result = schema.validate({
+  cpf: "123.456.789-09",
+  cnpj: "11.222.333/0001-81",
+  nis: "123.45678.90-1",
+  cnh: "02650306461",
+  cep: "01001-000",
+  telefone: "(11) 3456-7890",
+  pix: "email@dominio.com",
+  boleto: "34191.79001 01043.510047 91020.150008 6 84570000002000",
+  celular: "(11) 98765-4321",
+});
+
+if (result.error) {
+  console.error(result.error.details);
+}
+```
+
+## Regras disponíveis
+
+As regras abaixo validam o valor e retornam erro com mensagens específicas:
+
+- `document().cpf()` — CPF inválido
+- `document().cnpj()` — CNPJ inválido
+- `document().nis()` — NIS inválido
+- `document().cnh()` — CNH inválida
+- `document().cep()` — CEP inválido
+- `document().phone()` — Telefone inválido
+- `document().pix()` — Chave PIX inválida
+- `document().boleto()` — Boleto inválido
+- `document().celular()` — Celular inválido
+
+## Mensagens de erro personalizadas
+
+Você pode customizar mensagens normalmente pelo Joi:
+
+```typescript
+const schema = JoiExtended.object({
+  cpf: JoiExtended.document().cpf().messages({
+    "document.cpf": "CPF informado não é válido",
+  }),
+});
+```
diff --git a/docs/EXTENSOES/README.md b/docs/EXTENSOES/README.md
new file mode 100644
index 0000000..876f2b4
--- /dev/null
+++ b/docs/EXTENSOES/README.md
@@ -0,0 +1,3 @@
+# Extensões
+
+Nesta seção você encontra integrações do **br-docs** com bibliotecas de validação e outros ecossistemas.
diff --git a/package-lock.json b/package-lock.json
index 291893e..5da1000 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,8 +12,17 @@
         "@typescript-eslint/eslint-plugin": "^8.37.0",
         "@vitest/coverage-v8": "^3.2.4",
         "eslint": "^8.50.0",
+        "joi": "^17.0.0",
         "typescript": "^5.8.3",
         "vitest": "^3.2.4"
+      },
+      "peerDependencies": {
+        "joi": "^17.0.0"
+      },
+      "peerDependenciesMeta": {
+        "joi": {
+          "optional": true
+        }
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -629,6 +638,23 @@
         "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
       }
     },
+    "node_modules/@hapi/hoek": {
+      "version": "9.3.0",
+      "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.3.0.tgz",
+      "integrity": "sha512-/c6rf4UJlmHlC9b5BaNvzAcFv7HZ2QHaV0D4/HNlBdvFnvQq8RI4kYdhyPCl7Xj+oWvTWQ8ujhqS53LIgAe6KQ==",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@hapi/topo": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@hapi/topo/-/topo-5.1.0.tgz",
+      "integrity": "sha512-foQZKJig7Ob0BMAYBfcJk8d77QtOe7Wo4ox7ff1lQYoNNAb6jwcY1ncdoy2e9wQZzvNy7ODZCYJkK8kzmcAnAg==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
     "node_modules/@humanwhocodes/config-array": {
       "version": "0.13.0",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.13.0.tgz",
@@ -1186,6 +1212,30 @@
         "win32"
       ]
     },
+    "node_modules/@sideway/address": {
+      "version": "4.1.5",
+      "resolved": "https://registry.npmjs.org/@sideway/address/-/address-4.1.5.tgz",
+      "integrity": "sha512-IqO/DUQHUkPeixNQ8n0JA6102hT9CmaljNTPmQ1u8MEhBo/R4Q8eKLN/vGZxuebwOroDB4cbpjheD4+/sKFK4Q==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
+    "node_modules/@sideway/formula": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@sideway/formula/-/formula-3.0.1.tgz",
+      "integrity": "sha512-/poHZJJVjx3L+zVD6g9KgHfYnb443oi7wLu/XKojDviHy6HOEOA6z1Trk5aR1dGcmPenJEgb2sK2I80LeS3MIg==",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@sideway/pinpoint": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@sideway/pinpoint/-/pinpoint-2.0.0.tgz",
+      "integrity": "sha512-RNiOoTPkptFtSVzQevY/yWtZwf/RxyVnPy/OcA9HBM3MlGDnBEYL5B41H0MTn0Uec8Hi+2qUtTfG2WWZBmMejQ==",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
     "node_modules/@types/chai": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
@@ -2563,6 +2613,20 @@
         "@pkgjs/parseargs": "^0.11.0"
       }
     },
+    "node_modules/joi": {
+      "version": "17.13.3",
+      "resolved": "https://registry.npmjs.org/joi/-/joi-17.13.3.tgz",
+      "integrity": "sha512-otDA4ldcIx+ZXsKHWmp0YizCweVRZG96J10b0FevjfuncLO1oX59THoAmHkNubYJ+9gWsYsp5k8v4ib6oDv1fA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.3.0",
+        "@hapi/topo": "^5.1.0",
+        "@sideway/address": "^4.1.5",
+        "@sideway/formula": "^3.0.1",
+        "@sideway/pinpoint": "^2.0.0"
+      }
+    },
     "node_modules/js-tokens": {
       "version": "9.0.1",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-9.0.1.tgz",
diff --git a/package.json b/package.json
index d62f91e..812638f 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,9 @@
     "./cnh": "./dist/cnh.js",
     "./cep": "./dist/cep.js",
     "./telefone": "./dist/telefone.js",
-    "./boleto": "./dist/boleto.js"
+    "./boleto": "./dist/boleto.js",
+    "./nis": "./dist/nis.js",
+    "./joi": "./dist/joi.js"
   },
   "scripts": {
     "build": "tsc",
@@ -39,7 +41,16 @@
     "cpf",
     "phone",
     "cep",
-    "cnpj"
+    "cnpj",
+    "pix",
+    "boleto",
+    "cnh",
+    "nis",
+    "uuid",
+    "email",
+    "documentos",
+    "validacao",
+    "formatacao"
   ],
   "author": "Mateus Teruki",
   "description": "Utilitários para validação e formatação de documentos brasileiros como CPF, telefone, CEP e CNPJ.",
@@ -49,7 +60,16 @@
     "@vitest/coverage-v8": "^3.2.4",
     "eslint": "^8.50.0",
     "typescript": "^5.8.3",
-    "vitest": "^3.2.4"
+    "vitest": "^3.2.4",
+    "joi": "^17.0.0"
+  },
+  "peerDependencies": {
+    "joi": "^17.0.0"
+  },
+  "peerDependenciesMeta": {
+    "joi": {
+      "optional": true
+    }
   },
   "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
 }
diff --git a/src/__tests__/cnh.test.ts b/src/__tests__/cnh.test.ts
index c038a54..a54b7bc 100644
--- a/src/__tests__/cnh.test.ts
+++ b/src/__tests__/cnh.test.ts
@@ -3,7 +3,7 @@ import { describe, it, expect } from "vitest";
 
 describe("CNH Validation", () => {
   it("should validate a correct CNH", () => {
-    expect(Cnh.isValid("12345678900")).toBe(true);
+    expect(Cnh.isValid("60930978987")).toBe(true);
   });
 
   it("should invalidate an incorrect CNH", () => {
diff --git a/src/__tests__/joi.test.ts b/src/__tests__/joi.test.ts
new file mode 100644
index 0000000..4f80f01
--- /dev/null
+++ b/src/__tests__/joi.test.ts
@@ -0,0 +1,54 @@
+import BaseJoi, { Schema } from "joi";
+import validator from "../joi";
+import { describe, expect, it } from "vitest";
+
+const Joi = BaseJoi.extend(validator);
+
+function expectOk(schema: Schema, value: string) {
+  const { error } = schema.validate(value);
+  expect(error).toBeUndefined();
+}
+
+function expectErr(schema: Schema, value: string, code: string) {
+  const { error } = schema.validate(value);
+  expect(error).toBeTruthy();
+  expect(error!.details[0].type).toBe(code);
+}
+
+describe("br-docs Joi extension", () => {
+  it("cpf", () => {
+    expectOk(Joi.document().cpf(), "529.982.247-25");
+    expectErr(Joi.document().cpf(), "123", "document.cpf");
+  });
+
+  it("cnpj", () => {
+    expectOk(Joi.document().cnpj(), "04.252.011/0001-10");
+    expectErr(Joi.document().cnpj(), "123", "document.cnpj");
+  });
+
+  it("nis", () => {
+    expectOk(Joi.document().nis(), "16029214650");
+    expectErr(Joi.document().nis(), "16029214651", "document.nis");
+  });
+
+  it("cnh", () => {
+    expectOk(Joi.document().cnh(), "60930978987");
+    expectErr(Joi.document().cnh(), "11111111111", "document.cnh");
+  });
+
+  it("cep / phone / celular / uuid / pix", () => {
+    expectOk(Joi.document().cep(), "01001-000");
+    expectOk(Joi.document().phone(), "1133334444");
+    expectOk(Joi.document().celular(), "11999998888");
+    expectOk(Joi.document().uuid(), "550e8400-e29b-41d4-a716-446655440000");
+    expectOk(Joi.document().pix(), "a@b.com");
+  });
+
+  it("boleto", () => {
+    expectOk(
+      Joi.document().boleto(),
+      "00190.00009 02372.190005 00017.356171 9 63690000007179",
+    );
+    expectErr(Joi.document().boleto(), "123", "document.boleto");
+  });
+});
diff --git a/src/cnh.ts b/src/cnh.ts
index d58b6fa..40982ad 100644
--- a/src/cnh.ts
+++ b/src/cnh.ts
@@ -1,19 +1,6 @@
 import { IDocumentHandler } from ".";
 import clean from "./utils/cleanString";
 
-/**
- * Função auxiliar para calcular o dígito verificador de um número.
- * @param digits
- * @returns {number} O dígito verificador calculado.
- */
-const calcDigit = (digits: string): number => {
-  const digit = digits
-    .split("")
-    .reduce((acc, digit, index) => acc + parseInt(digit, 10) * (9 - index), 0);
-  const remainder = digit % 11;
-  return remainder < 2 ? 0 : 11 - remainder;
-};
-
 export class Cnh implements IDocumentHandler<string> {
   constructor(private cnh: string) {}
 
@@ -40,14 +27,32 @@ export class Cnh implements IDocumentHandler<string> {
 
     const cleanCnh = clean(cnh);
 
-    const firstDigit = calcDigit(cleanCnh.slice(0, 9));
-    const secondDigit = calcDigit(cleanCnh.slice(0, 10));
+    if (cleanCnh.length !== 11) return false;
+    if (/^(\d)\1{10}$/.test(cleanCnh)) return false;
+
+    const base = cleanCnh.slice(0, 9).split("").map(Number);
+
+    let sum1 = 0;
+    let sum2 = 0;
+
+    for (let i = 0; i < 9; i++) {
+      sum1 += base[i] * (9 - i);
+      sum2 += base[i] * (1 + i);
+    }
+
+    const dv1Raw = sum1 % 11;
+    const dv1 = dv1Raw > 9 ? 0 : dv1Raw;
+
+    let dv2 = sum2 % 11;
+
+    if (dv1Raw > 9) {
+      dv2 = dv2 - 2;
+      if (dv2 < 0) dv2 += 9;
+    }
+
+    if (dv2 > 9) dv2 = 0;
 
-    return (
-      cleanCnh.length === 11 &&
-      cleanCnh[9] === firstDigit.toString() &&
-      cleanCnh[10] === secondDigit.toString()
-    );
+    return cleanCnh[9] === String(dv1) && cleanCnh[10] === String(dv2);
   }
   /**
    * Formata uma CNH brasileira.
diff --git a/src/index.ts b/src/index.ts
index 21af4a7..50ef222 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,6 @@
+import { Cnpj } from "./cnpj";
+import { Cpf } from "./cpf";
+
 /**
  * Interface que define o método de validação de um documento.
  * Implementa o método de validação que verifica se o documento é válido.
@@ -45,3 +48,35 @@ export { Cep } from "./cep";
 export { Telefone } from "./telefone";
 export { Cnh } from "./cnh";
 export { Boleto } from "./boleto";
+export { Nis } from "./nis";
+
+export const validator = (joi: any) => ({
+  type: "document",
+  base: joi.string(),
+  messages: {
+    "document.cpf": "CPF inválido",
+    "document.cnpj": "CNPJ inválido",
+  },
+  rules: {
+    cpf: {
+      validate(value: any, helpers: any, args: any, options: any) {
+        if (!Cpf.isValid(value)) {
+          return helpers.error("document.cpf");
+        }
+
+        return value;
+      },
+    },
+    cnpj: {
+      validate(value: any, helpers: any, args: any, options: any) {
+        if (!Cnpj.isValid(value)) {
+          return helpers.error("document.cnpj");
+        }
+
+        return value;
+      },
+    },
+  },
+});
+
+export default validator;
diff --git a/src/joi.ts b/src/joi.ts
new file mode 100644
index 0000000..70cb985
--- /dev/null
+++ b/src/joi.ts
@@ -0,0 +1,68 @@
+import type { ExtensionFactory } from "joi";
+
+import { Cpf } from "./cpf";
+import { Cnpj } from "./cnpj";
+import { Nis } from "./nis";
+import { Cnh } from "./cnh";
+import { Cep } from "./cep";
+import { Telefone } from "./telefone";
+import { Pix } from "./pix";
+import { Boleto } from "./boleto";
+import { Celular } from "./celular";
+
+const validator: ExtensionFactory = (joi) => ({
+  type: "document",
+  base: joi.string(),
+  messages: {
+    "document.cpf": "CPF inválido",
+    "document.cnpj": "CNPJ inválido",
+    "document.nis": "NIS inválido",
+    "document.cnh": "CNH inválida",
+    "document.cep": "CEP inválido",
+    "document.phone": "Telefone inválido",
+    "document.uuid": "UUID inválido",
+    "document.pix": "Chave PIX inválida",
+    "document.boleto": "Boleto inválido",
+    "document.celular": "Celular inválido",
+  },
+  rules: {
+    cpf: {
+      validate: (value, helpers) =>
+        Cpf.isValid(value) ? value : helpers.error("document.cpf"),
+    },
+    cnpj: {
+      validate: (value, helpers) =>
+        Cnpj.isValid(value) ? value : helpers.error("document.cnpj"),
+    },
+    nis: {
+      validate: (value, helpers) =>
+        Nis.isValid(value) ? value : helpers.error("document.nis"),
+    },
+    cnh: {
+      validate: (value, helpers) =>
+        Cnh.isValid(value) ? value : helpers.error("document.cnh"),
+    },
+    cep: {
+      validate: (value, helpers) =>
+        Cep.isValid(value) ? value : helpers.error("document.cep"),
+    },
+    phone: {
+      validate: (value, helpers) =>
+        Telefone.isValid(value) ? value : helpers.error("document.phone"),
+    },
+    pix: {
+      validate: (value, helpers) =>
+        Pix.isValid(value) ? value : helpers.error("document.pix"),
+    },
+    boleto: {
+      validate: (value, helpers) =>
+        Boleto.isValid(value) ? value : helpers.error("document.boleto"),
+    },
+    celular: {
+      validate: (value, helpers) =>
+        Celular.isValid(value) ? value : helpers.error("document.celular"),
+    },
+  },
+});
+
+export default validator;